Method for marking or drilling holes in glass lenses and device for realizing the same

ABSTRACT

To at least one of mark and drill holes in a workpiece spectacle lens, a position of bores of a lens template is scanned, in which the template includes one of a template spectacle lens, a pattern disk and a support disk. The scanning is performed by a scanning arrangement situated in one of a device for coquilles, a device to cut support disks for spectacle frames, and a spectacle lens edging machine. Data is acquired concerning the position of the bores in accordance with the scanning, and is then fed to a computer. The data includes at least one of rectangular and polar coordinates of the position of the bores. At least one of marking and drilling the holes in the workpiece spectacle lens is performed using a Computer-Numeric-Controlled device in accordance with the data concerning the position of the bores.

FIELD OF THE INVENTION

The invention relates to a method for marking or drilling holes inspectacle lenses, and to a device for carrying out the method.

BACKGROUND INFORMATION

The nose bridge and the bows of rimless spectacles are usually screwedonto the form-ground spectacle lenses. It is therefore necessary for thebores for fastening the nose bridge and the bows to be made in apositionally accurate fashion in the form-ground spectacle lenses. Theposition of these bores is determined by the shape of the spectaclelenses and of the nose bridge and the bows and fixed by the manufacturerof these parts. For the purpose of selecting such rimless spectacles,the elements, screwed onto a so-called support disk, are supplied andpermit the rimless spectacles to be tried without the use of opticallenses. Frequently, a pattern disk for grinding the contour of thespectacle lenses is also supplied with the rimless spectacles, and thispattern disk is likewise provided by the manufacturer with the bores forfastening the spectacle frame elements.

The optician uses the pattern disk or support disk provided with thefastening bores to mark the bores on a spectacle lens, and drills theholes by means of a suitable drilling device.

If the spectacle lenses are to be exchanged while retaining the elementsof the spectacle frame, because, for example, the visual acuity of thespectacle wearer has changed, or because one of the spectacle lenses hasbeen broken, it is possible to use an existing spectacle lens, alreadyprovided with bores, for marking the bores.

SUMMARY OF THE INVENTION

It is obvious that this marking of the bores and the subsequent drillingof the holes are attended by a substantial manual outlay which requiresgreat skill on the part of the optician and therefore gives rise tocosts which can also rise by virtue of the fact that drilling the holesby means of conventional drilling devices frequently leads to breakageof the spectacle lens, which can then no longer be used.

It is the object of the invention to simplify and speed up the markingor drilling of holes in spectacle lenses, to increase the accuracy andto reduce the risk of lens breakage when drilling.

Starting from this formulation of the problem, a method is proposed formarking or drilling holes in spectacle lenses, in which, according tothe invention, the position of bores in a spectacle lens or a patterndisk or a support disk is scanned with or without contact, the dataacquired on the position of the bores are fed to a computer asrectangular or polar coordinates and used to control the marking ordrilling by means of a CNC-controlled marking or drilling device.

The invention proceeds from the consideration that the outlay onacquiring the data on the position of the bores is small, since only onepair of values (x, y), (r, φ) is required for each bore, and these pairsof values can accurately and quickly effect control of the marking orthe drilling by means of a CNC-controlled marking or drilling device.

The marking of the holes can be performed by means of an ink jet or acounterboring cutter. In this case, the actual drilling of the holes iscarried out in a conventional drilling device.

The holes are preferably drilled by means of a CNC-controlled drillingdevice, it being necessary to adapt the drilling tool to the spectaclelens material. If, for example, silicate lenses are involved, it ispreferred to use a diamond drilling tool, while drilling tools made fromhard metal are suitable for drilling plastic lenses.

The scanning of the position of the bores can be carried out, forexample, in a centering device for coquilles. Such centering devicesserve the purpose of mounting a holding element in the form of a blockor sucker on a coquille which can be detected in a viewing optics or ona screen, and on which an image of the form-ground spectacle lens issuperimposed in accordance with the spectacle frame, in order to insertthe coquille in a positionally accurate fashion into a spectacle lensholding shaft on a spectacle lens edging machine, after which formgrinding is carried out in accordance with the prescribed spectacle lensshape.

The scanning of the position of the bores can also be carried out in adevice for scanning the contour of a pattern disk. By means of such adevice, the contour of a pattern disk is acquired in the form of a datarecord and used to control the form grinding by means of aCNC-controlled spectacle lens edging machine. Moreover, it is alsopossible for the position of the bores to be scanned in a device forcutting support disks for spectacle frames. Support disks are used,inter alia, for the purpose of marking the viewing points of thespectacle wearer during adaptation to the new spectacle frame. Such adevice for cutting support disks is described in DE 40 03 001 C1 of thesame applicant.

A further possibility for scanning the position of the bores consists inmaking use for this purpose of a spectacle lens edging machine in whichthe marking or drilling of the holes is also performed. It isadvantageous in this case to make use of the same computer for acquiringthe data and for controlling the marking or drilling, as well as forcontrolling the form grinding of the spectacle lens.

A video system with screen display of the contour of the spectacle lensor the pattern disk or the support disk and the bores can also be usedfor scanning the position of the bores if this video system is set upsuch that the acquisition of the data on the position of the bores isperformed by means of automatic image evaluation.

In the case of a video system without automatic image evaluation, or ifthe spectacle lens, the pattern disk or the support disk are laid onto adigitizing tablet, the data on the position of the bores can be acquiredby marking the bores, which are visible on the screen or the digitizingtablet, by means of a cursor which can be moved by a keyboard or acomputer mouse, and are recorded by clicking on the respective bore.

The position of the holes in spectacle lenses can be input in aparticularly simple way as a data record into a computer which is usedfor directly controlling the marking or drilling by means of aCNC-controlled marking or drilling device. This inputting of the datarecord can be accomplished in the form of rectangular or polarcoordinates by means of a keyboard connected to the computer, or byreading in the data record, which is stored on a floppy disk, an EPROMor a magnetic strip, or is represented by means of a barcode. Thesestored data records can be supplied by the manufacturer of the spectacleframe, and can also comprise a data record for grinding thecircumferential contour of the spectacle lens. It is likewise possibleto acquire these data records by scanning a spectacle lens, a patterndisk or a support disk.

In order to solve the problem mentioned at the beginning, there isproposed a marking or drilling device for marking or drilling holes inspectacle lenses, having an input device for inputting the coordinates(X_(n), Y₁; X₂, Y₂) or (r_(n), φ_(n)) of the holes into a computer and apositioning device, controlled by the computer in accordance with theinput coordinates, for the marking or drilling device with reference tothe spectacle lens. A laser drill may be used as the marking or drillingdevice.

If use is made of a drilling tool running at high speed, it is possibleto use for this a drive designed as an air turbine, as a combinedair-water turbine or as a high-frequency electric motor.

Particularly preferred is a marking or drilling device on a spectaclelens edging machine, having a computer for controlling the form grindingof spectacle lenses, at least one grinding wheel in a grinding chamber,a spectacle lens holding shaft which can rotate in a fashion capable ofangle encoding, can be adjusted radially and axially relative to thegrinding wheel and can be locked, an angle sensor for acquiring theangle of rotation (φ_(n)) of the spectacle lens holding shaft, aposition sensor for acquiring the radial distance (X_(n)) of thespectacle lens holding shaft from the grinding wheel, a position sensorfor acquiring the axial position (Z_(n)) of the spectacle lens holdingshaft with reference to the grinding wheel, and an input device forinputting coordinates (X₁, Y₁; X₂, Y₂) of the holes into the computer.

By virtue of the fact that the marking or drilling device is arranged onthe spectacle lens edging machine, it can be controlled by the samecomputer which is also used to control the form grinding of spectaclelenses.

The marking or drilling device can be arranged such that it can betelescoped in the X-direction either in a niche of the grinding chamberor outside the grinding chamber, in the first case the spectacle lens tobe marked or drilled being held at that point in the spectacle lensholding shaft at which the form grinding is also carried out while, inthe second case, a holder is to be provided for a spectacle lens, whichis to be marked or drilled, outside the grinding chamber on thespectacle lens holding shaft.

When the marking or drilling device is coupled in terms of movement tothe spectacle lens holding shaft or the grinding wheel in theX-direction and Z-direction, the positioning of the marking or drillingdevice with reference to the spectacle lens held by the spectacle lensholding shaft can be performed by the computer in a fashion controlledas a function of the input coordinates of the holes, the same movementcontrol being used for this purpose as also serves for the form grindingof the spectacle lens.

It is also advantageously possible to arrange the scanning device forthe position of the bores in a spectacle lens or a pattern disk or asupport disk on the spectacle lens edging machine, and to couple it interms of movement to the spectacle lens holding shaft or the grindingwheel in the X-direction and Z-direction. In this case, a sensing armcan project radially into the region of the spectacle lens held by thespectacle lens holding shaft, of the pattern disk or the support disk, asensing element which acts with or without contact being arranged on thesensing arm.

When the sensing element is designed as a sensing pin, this sensing pincan guided in the X-direction and Z-direction up to the respective borein the spectacle lens or the pattern disk or support disk, which isbrought into the region of the sensing element by rotating the spectaclelens holding shaft. The coordinates of the hole are recorded in thiscase and fed to the computer.

The sensing element can also be designed as an optoelectronic sensingdevice which is capable of recording the coordinates of a hole in aspectacle lens held by the spectacle lens holding shaft, a pattern diskor a support disk.

A linear, optoelectronic sensing device, for example a charge-coupled(CCD), linear image scanner can preferably be arranged on the sensingarm which, during a revolution of the spectacle lens holding shaftdetects both the position of the bores and the circumferential contourof a spectacle lens, of a pattern disk or a support disk, and feeds themto the computer for controlling the form grinding and the marking anddrilling of the holes.

The scanning device can be arranged both inside and outside the grindingchamber and serves simultaneously as a marking or drilling device when,for example, the sensing pin is simultaneously the drilling tool, orwhen the optoelectronic sensing device is designed as a laser devicewhich, by controlling the intensity of the laser beam, can be used bothas a scanning device and as a marking or drilling device.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail below with the aid of aplurality of exemplary embodiments illustrated in the drawing, in which:

FIG. 1 shows a diagrammatic front view of a spectacle lens edgingmachine having a device for scanning the position of bores in a grindingwheel, outside the grinding-chamber,

FIG. 2 shows a cross section through a spectacle lens edging machinehaving a device for scanning and/or a device for marking or drillingholes in spectacle lenses, and

FIG. 3 shows a centering device set up for scanning the position of thebores in spectacle lenses, pattern disks or support disks.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The spectacle lens edging machine illustrated in FIG. 1 has a housing 1with a grinding chamber 2 in which a pregrinding wheel 4, which isarranged on a shaft 3 and has a cylindrical circumference, and twobeveling grinding wheels 5, 6 with different beveling grooves arearranged. Arranged with its axis parallel to the shaft 3 with thegrinding wheels 4, 5, 6 is a spectacle lens holding shaft made from twohalf shafts 7, 8, of which the half shaft 7 can be axially displaced bymeans of a handle 9, in order to clamp a rough cast lens (notillustrated). The grinding chamber 2 is closed during the grindingoperation by means of a cover (not illustrated).

For the purpose of grinding, the shaft 3 with the grinding wheels 4, 5,6 is set rotating rapidly, while a rough cast lens held by the spectaclelens holding shaft 7, 8 rotates slowly. The distance of the spectaclelens holding shaft 7, 8 from the shaft 3 with the grinding wheels 4, 5,6 is controlled by a computer 10 in which control data for grinding therough cast lens in accordance with the shape of a selected spectacleframe are stored.

Also arranged on the housing 1 are an input keyboard 11 and a screen 12.The input keyboard 11 can be used to call spectacle lens contours storedin a known way, and to lead them to the controller of the spectacle lensedging machine for the purpose of spectacle lens machining.

It is also possible to use the input keyboard 11 to input personal dataof the spectacle wearer, for example the pupil separation, the axisposition of a cylindrical or prismatic cut of the spectacle lens, or theposition of a reading portion.

A screen 12 is used to display the input data. It is also possible toillustrate on the screen 12 the circular rough cast lens and/or aspectacle lens which is to be form-ground in accordance with the inputdata.

An end 14 of the half shaft 8 is led out at the side of the housing 1.Arranged on this end 14 is a holder in the form of pins 15, 16 ofdifferent diameters for a pattern disk 17. The pattern disk hascorresponding holes of corresponding diameter, and so it can be mountedon the projecting end 14 of the half shaft 8 only in a specific angularposition.

Arranged on a holder 19 projecting from the housing 1 is a sensing arm18 which can be telescoped and on whose free end in the region of thepattern disk 17 there is arranged a sensing element 20 which isillustrated here as a sensing pin. The sensing arm 18 can be moved inthe direction of the arrow 23, while the holder 19 can be moved in thedirection of the arrow 24.

By rotating the spectacle lens holding shaft 7, 8, a bore 21 and a bore22 are adjusted such that the sensing pin 20 can be inserted into thebore 21 or 22 by displacing the sensing arm 18 in the direction of thearrow 23 and displacing the holder 19 in the direction of the arrow 24.The associated angle φ of the spectacle lens holding shaft 7, 8 isrecorded by an angle sensor 13, while the distance r of the bore 21 or22 from the axis of the spectacle lens holding shaft 7, 8 is acquired bya position sensor (not illustrated) connected to the sensing arm 18. Therecorded coordinates of the bores 21 and 22 pass into the computer 10and are displayed on the screen 12 in the image 17′ of the pattern disk17 as images of the bores 21′ and 22′, respectively. Since the screen 12is provided with a rectangular axis intersection 46, the coordinates X₁,Y₁ of the bore 22′ and the coordinates X₂, Y₂ of the bore 21′ can beread off on the screen 12 and used to mark and/or drill appropriateholes in a spectacle lens held between the half shafts 7, 8 when thespectacle lens edging machine has an appropriate marking or drillingdevice.

The coordinates X₁, Y₁ and X₂, Y₂ for the bores 22′, 21′ can also beused for the purpose of driving a marking or drilling device separatedfrom the spectacle lens edging machine, or to input the coordinates intosuch a marking or drilling machine by means of a keyboard or in anothersuitable way such as, for example, by means of a floppy disk, an EPROM,a barcode or a magnetic strip.

The holder 19 can also be coupled in terms of movement in theX-direction and Z-direction to the movement controller of the grindingwheels 4, 5, 6 with respect to the spectacle lens holding shaft 7, 8,with the result that the movements of the holder 19 effect the recordingof the coordinates of the holes 21, 22 via corresponding positionpickups on the movement controller for the grinding wheels 4, 5, 6. Inthis case, the sensing arm 18 can be permanently arranged on the holder19, although it is also possible that it can be telescoped from a idleposition into an operating position.

In conjunction with coupling the movement to the grinding wheels 4, 5,6, the arrangement of the sensing arm such that it can be telescoped isparticularly advantageous when the sensing device 18, 19, 20 is arranged(in a way that is not illustrated) in the grinding chamber 2, and thesensing arm 18 is located in the idle position in a niche of thegrinding chamber 2.

Instead of a pattern disk 17, it is also possible for a spectacle lenshaving fastening holes, or a support disk to be fastened on theprojecting end 14 of the half shaft 8, in order to acquire the positionof the holes.

Instead of a sensing pin 20, it is also possible to arrange anoptoelectronic sensing element on the sensing arm 18, in order to recordthe position of the holes 21, 22.

When this optoelectronic sensing element is designed as a charge-coupled(CCD), linear image scanner, it is thereby possible to determine boththe circumferential contour of a pattern disk 17 of a form-groundspectacle lens or of a support disk, and the position of the bores, andto use them to control the form grinding and the marking or drilling ofthe holes.

An already form-ground spectacle lens 25 which is held by the spectaclelens holding shaft 7, 8 is illustrated in the spectacle lens edgingmachine illustrated in FIG. 2.

A guide 45 for a telescopic arm 27, which supports a high-speed drilldrive 26, is arranged on a bearing neck 28 of a bearing support 38 forthe shaft 3 of the grinding wheels 4, 5, 6. Air turbines, combinedair-water turbines or high-frequency electric motors are suitable as adrill drive.

Also fastened, by means of fastening screws 30, on the bearing neck 28is a spray guard 29 which encompasses the grinding wheels 4, 5, 6. Thebearing support 38 is connected to a slide part 32 of a compound slide31. The slide part 32 is guided by means of guide bars 33 in bores 34 inattachments 35 of a second slide part 36. Guide rails 37 run at rightangles to the guide bars 33 of the slide part 32, with the result thatthe compound slide 31 can be displaced under computer control in theX-direction, that is to say in the direction of the guide bars 33, andin the Z-direction, that is to say in the direction of the guide rails37. A drive motor 40, which acts on the slide part 32 via anelectromagnetic clutch 41, is illustrated, and a position sensor 43serves to monitor the positional control in the X-direction. Acorresponding position' sensor 44 serves to monitor the positionalcontrol in the Z-direction. Both the drives in the X-direction andZ-direction, and the corresponding position sensors 43, 44 are connectedto the computer 10 via control lines 42.

The compound slide 31 with the drives and position sensors 43, 44 isarranged in a machine subframe 39 which also supports the housing 1.

The form grinding of the spectacle lens 25 is performed under thecontrol of a computer by means of the computer 10, with the use of adata record which is input into the computer and corresponds to theshape of the spectacle lens.

Before the form grinding, or after the form grinding, the bores 21″, 22″can be made in the spectacle lens 25 by advancing the high-speed drilldrive 26 on the telescopic arm 27 from an idle position (notillustrated), in which it is located in a niche of the grinding chamber2, into the operating position illustrated in FIG. 2.

In the exemplary embodiment illustrated, the drill drive on thetelescopic arm 27 with the guide 45 is coupled to the movement of thecompound slide 31. Consequently, the X-coordinate of the holes 21″, 22″are set by moving the slide part 32 in accordance with the inputcoordinates. At the same time, the spectacle lens holding shaft 7, 8 isrotated in accordance with the position of the bore 21″ or 22″ such thatthe bore is situated on the vertical connecting line of the axes of thegrinding wheel shaft 3 and the spectacle lens holding shaft 7, 8, afterwhich the slide part 36 is moved in the Z-direction and the drill drive26 is set operating. A drilling tool on the drill drive 26 now drillsthe holes 21″, 22″ by virtue of the fact that the slide part 36 isimparted a corresponding feed movement.

When the telescopic arm 27 is arranged in a guide 45 which is notcoupled in terms of movement to the compound slide 31, but is fastenedat a suitable point on the machine frame 39, the drill drive 26 can beset to the X-coordinate 21″, 22″ by controlling the movement of thetelescopic arm 27 by means of the computer 10, without there being aneed to move the compound slide 31 for this purpose. In this case, itmust be possible to provide for an axial feed movement of the drillingtool on the drill drive 26 toward the spectacle lens 25 or, vice versa,for an axial movement of the spectacle lens 25 toward the drilling toolon the drill drive 26.

It is also possible to use a laser drilling device instead of a drillingtool with a high-speed drill drive 26. Moreover, it is possible to usethe drilling device 26, 27 as scanning device for the position of thebores 21, 22 in a pattern disk when this pattern disk is clamped in thegrinding chamber 2 between the half shafts 7, 8 and the drilling tool isused as sensing pin for insertion into the holes 21, 22 in a patterndisk 17, or when, in the case of a laser drilling device, the laser beamis used to determine the position of the holes.

It is likewise possible for a spectacle lens or a support disk to beclamped between the half shafts 7, 8, in order to scan the correspondingbores.

Furthermore, it is also possible for the scanning device 18, 19, 20described with reference to FIG. 1 to be arranged in addition to thedrilling device 26, 27 in the grinding chamber 2 of the spectacle lensedging machine when the scanning of the holes and the drilling are to beperformed by means of separate devices.

Illustrated in FIG. 3 is a centering unit which has in a housing 47 aviewing optics 48 which can comprise a purely optical system or ascreen. An image 17′ of a pattern disk 17 can be displayed in theviewing optics 48 by means of an electronic control unit 49, which isarranged in a housing lower part 50 for ergonomic reasons, and an inputkeyboard 57. This pattern disk 17 with the bores 21, 22 is mounted onsupport pins 52 of a carrier 51 and is held there by means of pins 54 ona hold-down 53. The pattern disk 17 can be aligned with the support pins52 such that the holes for the pins 15, 16 come to lie in a fashionillustrated with reference to the axis intersection 46, and the bores21, 22 appear as images 21′, 22′ in the viewing optics 48 in a fashionpositionally accurate with reference to the axis intersection 46. Acursor 58 can now be moved relative to the images 21′, 22′ of the boresby means of the keyboard 57, and the position or the coordinates can berecorded by clicking.

This cursor 58 can, of course, also be moved by means of a computermouse, and the coordinates of the bores 21, 22 can be recorded byclicking.

The coordinates X₁, Y₁; X₂, Y₂ can also be read off in the viewingoptics 48 and noted down, or be recorded on suitable data media.

The centering device in accordance with FIG. 3 can be connected so as toexchange data with the spectacle lens edging machine in accordance withFIG. 2, with the result that the coordinates, determined in thecentering device in accordance with FIG. 3, of the bores 21, 22 can betransmitted to the computer 10 of the spectacle lens edging machine andused there to control the drilling of the holes 21″, 22″.

The centering device in accordance with FIG. 3 is, moreover, used forthe purpose of aligning a rough cast lens in a similar way as wasdescribed with reference to the pattern disk 17, in accordance withwhich a swinging arm 55 with a holding part 56, fastened thereon, in theform of a block or sucker is lowered onto the rough cast lens, and theholding part 56 is connected to the rough cast lens such that the roughcast lens can subsequently be inserted accurately in terms of positionbetween the half shafts 7, 8 of the spectacle lens edging machine inaccordance with FIG. 1 or FIG. 2, and can be form-ground. Such acentering device is described in DE 42 33 400 C1 of the same applicant.

The holes can then be drilled in the way described inside or outside aspectacle lens edging machine.

I claim:
 1. A device to at least one of mark and drill holes in aworkpiece spectacle lens, the device comprising: a spectacle lens edgingmachine including a computer to control form grinding of the workpiecespectacle lens, a grinding chamber, at least one grinding wheel in thegrinding chamber, and a rotatable spectacle lens holding shaft which canbe adjusted radially and axially relative to the grinding wheel andlocked; an arrangement to at least one of mark and drill the holes intothe workpiece spectacle lens, the arrangement including an encodingarrangement operable to detect an angle of the spectacle lens holdingshaft, including an angle sensor operable to acquire an angle ofrotation of the spectacle lens holding shaft; and a positioning deviceto position the arrangement, the positioning device including a positionsensor to acquire a radial distance of the spectacle lens holding shaftfrom the grinding wheel, and including a position sensor to acquire anaxial position of the spectacle lens holding shaft with reference to thegrinding wheel, and an input device to accept input coordinatesincluding at least one of rectangular input coordinates and polar inputcoordinates of the holes into the computer.
 2. The device according toclaim 1, wherein the arrangement is configured to be telescoped in anX-direction in a niche of the grinding chamber of the spectacle lensedging machine.
 3. The device according to claim 2, wherein thearrangement is coupled in terms of movement to one of the spectacle lensholding shaft and the grinding wheel in the X-direction and aZ-direction, the positioning of the arrangement with reference to theworkpiece spectacle lens held by the spectacle lens holding shaft beingperformed by the computer as a function of the input coordinates of theholes.
 4. The device according to claim 1, wherein the arrangement isconfigured to be telescoped in an X-direction outside the grindingchamber of the spectacle lens edging machine, the spectacle lens holdingshaft having in the region of the device a holder for a spectacle lensto be at least one of marked and drilled.
 5. The device according toclaim 1, wherein the arrangement further includes a scanning device toscan for a position of bores in a lens template, the template includingone of a spectacle lens, a pattern disk and a support disk on thespectacle lens edging machine.
 6. The device according to claim 5,wherein the scanning device is moveably coupled to one of the spectaclelens holding shaft and the grinding wheel in an x-direction and az-direction.
 7. The device according to claim 6, wherein the sensingelement comprises a sensing pin.
 8. The device according to claim 5,wherein the arrangement includes a sensing arm projecting radially intoa region of the spectacle lens, held by the spectacle lens holdingshaft, into a region of the template, and the arrangement furtherincludes a sensing element on the sensing arm.
 9. The device accordingto claim 8, wherein the sensing element comprises an optoelectronicsensing device.
 10. The device according to claim 9, wherein the sensingelement includes a linear optoelectronic sensing device on the sensingarm.
 11. The device according to claim 10, wherein the sensing device isa charge-coupled (CCD), linear image scanner.
 12. The device accordingto claim 11, wherein during a revolution of the spectacle lens holdingshaft the sensing device is operable to detect both a position of thebores and a circumferential contour of the template, and is operable tofeed them to the computer which is operable to control the form grindingand the at least one of marking and drilling of the holes.
 13. Thedevice according to claim 5, wherein the scanning device is arrangedinside the grinding chamber.
 14. The device according to claim 5,wherein the scanning device is arranged outside the grinding chamber.15. The device according to claim 1, wherein the device also serves asscanning device which is operable to scan a position of the bores.
 16. Acentering device for lens blanks, comprising: a carrier configured toreceive a lens blank or a lens template having at least one boretherethrough, the lens template including one of a template spectaclelens, a pattern disk and a support disk; a swinging arm having a holdingpart to affix the holding part on the lens blank; a display screen; anelectronic control unit to display an image of the lens template on thedisplay screen, the bore of the lens template being displayed withrespect to a system of coordinates; and at least one of a keyboard and amouse to move a cursor over the image of the lens template to record aposition of the bore.
 17. The centering device of claim 16, wherein thearm is capable of being telescoped.
 18. A device to at least one of markand drill holes in a workpiece spectacle lens, the device comprising: aspectacle lens edging machine including a computer to control formgrinding of the workpiece spectacle lens, a grinding chamber, at leastone grinding wheel in the grinding chamber, and a rotatable spectaclelens holding shaft which can be adjusted radially and axially relativeto the grinding wheel and locked; an arrangement to at least one of markand drill the holes into the workpiece spectacle lens, the arrangementincluding an encoding arrangement operable to detect an angle of thespectacle lens holding shaft, including an angle sensor operable toacquire an angle of rotation of the spectacle lens holding shaft, thearrangement further including an arm and a high-speed drill drivesituated on the arm to at least one of mark and drill the holes, the armbeing motionally coupled to one of the spectacle lens holding shaft andthe grinding wheel in an X-direction and a Y-direction; a scanningarrangement having a sensing element to scan a position of the holes,the scanning arrangement being motionally coupled to at least one of thespectacle lens holding shaft and the grinding wheel in an X-directionand a Y-direction; and a positioning device to position the arrangement,the positioning device including a position sensor to acquire a radialdistance of the spectacle lens holding shaft from the grinding wheel,and including a position sensor to acquire an axial position of thespectacle lens holding shaft with reference to the grinding wheel, andan input device to accept input coordinates including at least one ofrectangular input coordinates and polar input coordinates of the holesinto the computer.
 19. The device of claim 18, wherein the sensingelement includes one of a sensing pin and an optoelectronic sensingdevice.